1.

A plank is moving on ground with a velocity `v` and a block is moving on the plank with respect to it with a velocity `u` as shown in figure. What is the velocity of block with respect to ground ? A. `v - u` towards rightB. `v - u` towards leftC. `u` towards rightD. none of these

Answer» Correct Answer - A
`vec v_b = vec v_(b,p) + vec v_p`
=`(-u) + v`(toward sign) `= v - u`.


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